Boiler



Oct. 18, 1932. I c. E. LU-CKE BOILER Original Filed Jan. 3, 1927 4 Sheets-Sheet l INVENTOR Kid ATTORN EY Oct. 18, 1932. v c. E. LUCKE 1,883,313

BOILER Original Filed Jan. 3, 1927 4 Sheets-Sheet 2 ATTORNEY Oct. 1 8, 1932. LUCKE 1,883,313

BOILER Original Filed Jan. :5, i927 4 Sheets-Shee t 3 INVENTOR ATTORN EY C. E. LUCKE Oct. 18, 1932.

BOILER 4 Sheets-Sheet 4 l 7/?5 106'@ TEX f ATTORNEY Original Filed Jan. 3, 1927 9 9 0/ i v 0 0 O 0W 0 0000000000000 o wo o" WW O 0 o o o o o o 0 Z 0 O 00 000 0 00009 0 0O 9 0 o o o o I O 0 o o 0 o oo Z 0 0 o o o o o O O 0 0 0 0 o o o o O o o o o o o o o o n o O ooooooooooooeooOooo ..l1Y 0 0 0 o o o r G O 0 O 0 0 o o Nw a 0 O 0 0 0 0 0 0 M Mo o 2 o o 0 o o o owow m wow fl O oo o o o w w w wwmww Z 0 0 0 0 0 00000 c o Z 6 9pm o Patented Oct. 18, 1932 CHARLES E. LUCIE, OF NEW YORK, N. Y.,

COMPANY, OF BAYONNE, NEW JERSEY,

ASSIG-NOR TO THE BABCOCK & WILCOX A CORPORATION OF NEW JERSEY BOILER Original application filed January 3, '1927, Serial No. 158,470. Divided and this application filed August 11,

1930. Serial No. 474,676.

This invention relates to steam boilers and more particularly to steam boilers employing forced circulation, and this application is a division of my previously filed application, Serial No. 158,470, filed Jan. 3, 1927. An object'of this invention is to provide a boiler of the type set forth having an improved arrangement for controlling the circulationof water through the boiler and especially adapted for use in those boilers where steam is generated in a forced flow section.

This and other objects which will be apparent to those skilled in this particular art areaccomplished by means of the invention illustrated in the accompanying drawings, in which Fig. 1 isa transverse sectional view through a part of a boiler setting illustrating I an arrangement of boiler sections and associated umpsarranged in accordance with one em odiment of this invention. Fig. 2 is a similar view of another arrangement of this invention, and Fig. 3 is a transverse sectional view on the line 33 of Fig. 2. Figs.

- 4 to 8 are perspective views showing various zb-tube arrang'ements in the gas pass. Fig. 9 is a sectional view showing one arrangement of tubes and headers. Fig. 10 is a view on the line 1010 of Fig. 9 and Fig. 11 is a top plan view of the arrangement shown in The particular embodiments of the invention which have been chosen for the purposes of illustration employ a feed pump having a water cylinderl and steam cylinder 2. The exhaust from the steam cylinder is delivered to a coil located inthe feed water tank 4 where it is condensed. Suction pipe 5 leads from the feed water tank to the feed water cylinder 1 and a feed ing a valve controlled by a float 7 delivers feed water to the tank from any desired source. A boiler feed delivery pipe 8 connects the water cylinder 1 with the boiler. A circulating pump of the displacement type is provided for' circulating the unvaporized water through the boiler. This pump has a steam cylinder 9 and water cylinder 10. Steam 'is delivered to the cylinder 9 by a pipe receiving steam from the steam and water separator 12 which also supplies steam sides of the furnace chamber, water delivery line 6 havto the steam cylinder 2 of the feed pump through the line 14. The water chamber 10 of the circulating pump has an outlet connection 13 leading to the boiler.

As illustrated in Fig. 1, the feed water flows from the feed pump through the feed water delivery line 8 to a header 230 located in the gas outlet flue of an associated boiler furnace, thence through tubes 231 extending back and forth across the pass and tube connecting headers or connectors 232 to the. circular header 233 located outside the setting. From the header 233 the flow is through a row of wall tubes 234 to a steam.

and waterdrum 235 located above the boiler setting and from which the mixture of steam and water passes through aconnecting pipe 23 to the steam and water separator 12.

The unvaporized water to be recirculated flows through the pipe '11 of the water cylin- .der -10 to the circulating pump and is forced curved wall tubes 243 to a header 244 connected by tubes 245 outside of the setting with the steam and water drum 235. Water also flows through the pipe 13 and branch pipes 13a to lower headers 246 on opposite side wall cooling tubes 247 to upper headers '248 and thence through connections 249 to the'steam and water drum 235.

The float mechanism in the steam and water separator 12 controls valve 19 in the steam line 14 supplying steam to the feed water pump, the fiow being connected to lever arm 17 connected-by chains or the like 18, thus regulating the feed water delivery by the water level in the steam and water separator 12. The valve 70 is controlled by the velocity of feed water through the feed thence through water supply line 8, and is located in the steam pipe 11 leading to the steam cylinder of the circulating pump, so that the rate of the circulating pump is controlled by the amount of feed water or by the rate of steam generation as more clearly disclosed in my above mentioned application.

In the boiler arrangement illustrated in Figs. 2 and 3, the feed water flows through the delivery line 8 to the bottom of a series of headers 250, thence through connecting tubes 251 to the top header connected by a suitable connection 252 to the vertical header 253 positioned in the upper part of the furnace chamber in the manner illustrated. Coils of tubes 254 connect the header 253 with a similarly arranged header 255 adjacent the front of the furnace setting from which the mixture of steam and water flows through the connection 256 to the header 257 connected by pipe 23 with the steam and water separating chamber 12.

The unvaporized water to be recirculated is drawn through the connecting pipe 11 by the circulating pump and forced through the pipe 13 to the header 258. The water delivered to the header 258 flows through a \row of wall cooling tubes which are bent above the top of the bridge wall so as to extend across the top of the outlet flue to a-header 260 located outside the boiler setting and connected to a row of roof tubes 261and' to a header 262 located outside the boiler setting on the opposite side of the furnace. From the latter header the flow is downward through wall cooling tubes 263 to the collecting header 257 and thence into the steam and water separator. 4

Another portion of the circulating water flows from the header 258 through co'nnec tions 264 into lower headers 265 on each side of the furnace chamber, thence through side wall cooling tubes 266 into upper headers 267. and thence through connections 268 to the collecting header 257.

The operation of the feed pump is controlled by the water level in the steam and water separating chamber, and the operation of the circulating pump is dependent upon the velocity of flow either of the feed water or of the steam generated as described in my above mentioned application. v

Figs. l to 11 illustrate details of various arrangements of the manner in which the coils may be installed in the feed water circuit and the way they are'contacted by the hot furnace gases. In Figs. t and the water passes in parallelthrough the tubes 270 each of which is made of straight portions 271 conf nected at their ends by connections 272 and a 273.

Inthe modification shown in Fig. 6, coils are made of straight tubes 27% and 2T5 connected at their ends by bends 276 and 277. In the modification illustrated in Fig. 7", the coils are made of straight tubes 2T9 having their ends jointed by connectors 280, the tubes being so connected that the water enters at 281 and leaves at 282. As illustrated in Fig. 8, the coil is made of straight portions connected by short bends 284: at one end and longer bends 285 at the other end, the water entering at 286 and leaving at 287.

Figs. 9 to 11 illustrate certain details of construction showing the way in which the tubes or tube coils of the feed water circulator may be arranged so as to give a decreased area for gas flow by graduated closer spacing as the gases cool for the purpose of maintaining the rate of heat absorption. The feed water enters from the pipe 289 into the lowest of a series of side headers which are placed one above the other so as to form the walls of the pass. The feed water passes through the lowermost row of tubes 291 into a header 292 on the opposite side of the flue and thence back and forth through successively higher rows of tubes and headers finally passing into the uppermost header 292 through nipples 293 into the drum 29%. The number and sizes of the tubes 291 are so arranged as to provide a larger area for gas flow where the gases are hottest, accordingly decreasing this area as the gases are cooled. As illustrated, this is accomplished by providing an increased number of'tubes of smaller diameter where the gases are cool and change in diameter of tubes and number of tubes being gradual from one end of the bank to the other. Feed water also flows from pipes 295 into the lower ends of the vertical side headers 296 and through them to the up er ends thereof, thence through nipples 29 to the adjacent headers, thence passing to the lower ends of such headers and crossing into the next adj acent headers in a similar way and so on up and down along both sides of the flue, passing finally through connections 298 into the. top-' most tube connecting header 292 and thence into the collecting drum 29 1 which may be connected to the steam and water separator.

It will be apparent that the present arrangement provides a furnace having side wall and roof tubes surrounding the furnace chamber and absorbing the. radiant heat therein. The boiler section located in the out- 1 let flue which may be termed the economizer section is the only section heated by convection heat. lVall tubes are also provided in the flue connecting the furnace chamber with the economizer section.

The modification illustrated in Fig. 2 prn-' by Letters Patent, is:

1. A steam generator comprising groups of water tubes located in a gas passage and including a series group disposed in the cooler end thereof, and a radiantly-heated group of parallel tubes in the hotter end thereof, parallel flow tubes intermediate the aforesaid groups .and each receiving Water from one of said previously named groups, a steam and water drum charge from all of said tubes, a steam and. water separator receiving steam and water from said drum, and water from said separator and discharging only to the radiantly heated group of par-v allel tubes, a second pump delivering water to the series group of tubes, the first named pump being controlled by the discharge from the last named pump, and'the water level in the separator controlling the operation of the last named pump, both pumps always operating to deliver more water to all of said tubes than can be converted into steam thereby.

2. A steam generator comprising groups of water tubes located in a gas passage and including a series group disposed in the cooler end thereof, and a radiantly heated group of parallel tubes in the hotter end thereof, parreceiving the disa pump receiving steam I ing water from one of said previously named groups, a steam and water drum receiving the discharge from all of said tubes, a steam and water separator receiving steam and water from said drum, a circulating pump receiving water from said separator and discharging onl to the radiantly heated group of parallel tubes, a feed pump delivering feed water to the series group of tubes, said circulating pump being controlled by the discharge from said feed pump, and the water level in the separator controlling the operation of said feed pump, both pumps always operating to deliver more water to allof said tubes than can -be converted into steam thereby.

CHARLES E. LUCKE.

I allel flow tubes intermediate the aforesaid groups and each receiving water from one of said previously, named groups, a steam and water drum receiving the discharge from all of said tubes, a steam and water separator receivingsteam and water from said drum, a pump receiving steam and water from said separatorand discharging only to the radiantly heated group of parallel tubes, a second pump delivering water tothe series group of tubes, the first named pump being controlled by the discharge from the last named pump, and the water level in the sepaof the last named pump, both pumps always operating to deliver more water to all of said tubes than can be converted into steam thereby, the series -group of tubes in the cooler end of said passage being spaced to compensate for the decrease in volume of gases passing therethrough and thereby maintaining the rate of heat absorption.

3. A steam generator comprising groups of water tubes located in an inverted U-shape gas passage and including a series group disposed in the cooler end thereof, and a radiantly heated group of parallel tubes in the hotter end thereof, parallel flow tubes intermediate the aforesaid groups and each receiv- 

